Why I did it
We hit an issue recently in the chassis bringup where the linux bde attach failed with the following ioctl error.
[ 9058.585960] linux-user-bde (897363): Error: Invalid ioctl (00004c1d)
[ 9105.668237] linux-user-bde (901002): Error: Invalid ioctl (00004c1d)
Debugged with Broadcom team, who suggested to use this flag BCM_INSTANCE_SUPPORT to support multi-instance scenarios ( platforms with more than one asic where there are separate sai/syncd docker instances running controller each asic instance).
This flag was introduced since SDK-6.5.21 and need to be present in SAI and SAI GPL kernel module makefile.
How I did it
Add the flag in this flag BCM_INSTANCE_SUPPORT in gpl modules
